Gary Craig Mertz , SLP
Speech-Language Pathologist β’ Waynesboro, PA
120 W Main St
Waynesboro, PA 17268
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
Practice Location & Contact Primary Location
120 W Main St
Waynesboro, PA 17268
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Cumberland, MD. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
What Public CMS Data Show
Speech-Language Pathologist: NPPES taxonomy is a reported classification, not proof of board certification.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Compared with the same specialty in Waynesboro and Pennsylvania
5 active clinicians are listed under Speech-Language Pathologist with a practice address in Waynesboro, PA (7,214 in Pennsylvania).
Addresses are self-reported to NPPES and may be out of date.
Sources: CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 235Z00000X
The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.
NUCC Taxonomy Code: 235Z00000X
The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.
NUCC Taxonomy Code: 235Z00000X
The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.
Secondary Practice Locations
157 Baltimore St, Suite 201
Cumberland, MD 215022319
Phone: 3017223215
157 Baltimore St, Suite 201
Cumberland, MD 215022319
Phone: 3017223215
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Occupational Therapist
Occupational Therapist Registered
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 120 W MAIN ST, WAYNESBORO, PA 17268 (Tel: 8149778339)
Registered at 209 LOYALTY LN, MARTINSBURG, WV 254033700 (Tel: 8149778339)
Additional practice office at 157 Baltimore St, Suite 201, Cumberland, MD 215022319
Speech-Language Pathologist (license number reported to NPPES: MD 04723)
NPI status registered as active in NPPES database
Registered at 157 BALTIMORE ST, SUITE 201, CUMBERLAND, MD 215022319 (Tel: 3017223215)
Registered at 585 QUAKER VALLEY RD, NEW PARIS, PA 155549226 (Tel: 8146231098)
Recorded as GARY MERTZ, SLP
Speech-Language Pathologist (license number reported to NPPES: MD 04723)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Mailing Address
209 Loyalty Ln
Martinsburg, WV 254033700
Phone: 8149778339